Composite shade for artificial lights.



PATENTED JUNE 19, 1906.

No. 823,622. I I

v I I 0. MYGATT.

COMPOSITE SHADE FOR ARTIFICIAL LIGHTS.

APPLICATION FILED MAR. a, 1906.

prismatic jections'to a minimum.

' external circumferential risms a of a char-- 1 In tGStIIIIODYQWhBI'GOfI afiix'my signature T0 aZZ z uhom it may concern/.-

UN TED STATES OTIS'A. MYGATT, .OFINIEYW YORK, N. Y.

PATENT OFFICE.

COMPOSITE SHADE FOR ARTIFICIAL LIGHTS.

a specification, reference being had therein to the accompanyingdrawings.

's invention relates to composite shades for artificial lights. 1

The object of the invention is to lobe or shade whichs substantial y theefficiency of the I'ismatic shade as to light direction, but shall e ofless weight and less subject to depreciation by dust. Figure 1 isavertical central section of a shade involving the present invention.Fig. 2 is a cross-section on line 2 2,.Fig. 1. For use with certainkinds of lights a part roduce a all have ordinar "of the commonprismatic shade or globe is inert or useless and sometimes evenobstructs and absorbs some of the light. Theprisms may be omitted fromthis art of the shade or globe with a gain in li tness and sometimeswith a gain in light" 'stribution.

Prism-glass has many advantages for many purposes, but in instances isobjectionable on account of its weight and on accountof the; b tdifiiculty ofremoving dust from the 'prisms.

My present invention reduces both these ob- In the glass shade or globev the trade) A the upper portion of the bodyhas acter now well known int s art and adaptedto" direct the light-rays which pass through rt ofthe shadein directions deter-' t s a mined by the lanei faces" of theseprisms, The interior oft e prismatic part of. the shade has vertical.ribs]; of a character which will i Specification of Letters Patent.Application filed March 9,1906. Serial No. 305.103.

Patented June is, 190

pass to the light-directing prisms. A tion (andin the exam 0 of the.shade is ma e thinand free from prisms. This portion ofthe shade can bemuch thinner and lighter-than the ribbed body and being substantiallysmooth does not accumulate dust to anything like the extent that theprismat'cportion of the shade is likely to do.' Such dust as athers onthe thin art can be readily wiped thin Po Is the lower portion) littledivergence. The thin part of the bodv y can be used as a support fordecorative'designs without in any way interfering with the divide anddiffuse the light-rays before they away. The ody passes rays which reachit with light-distributing.qualities of the prismatic part of the shade.

(so called 1 Itwill be understood. that the prismatic part of the shadewill have thedesired form and prismatic construction to give the desiredlight distribution or direction. The thin or smooth part of the shadewill be adapted thereto as clrcumstances require.

' The shade ispre'ssed in a mold, as usual with prismaticshades.

do not herein claim a shade made 'wifth decorate ,as such 18 claimed in'myapplication, Serial No. 269,548, filed July 13,1905;

.one part rismatic and another part thin and transparent glass,

site the same, and a zone of thinner glass eow said prismatic portion.

1npresence.oftwo'witnessesL W. A. BARTLETT, f

BROWN.

